transmitter.h

/* Copyright (C) 1998-99 Paul Barton-Davis This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. $Id: transmitter.h,v 1.3 2002/11/11 00:02:51 trutkin Exp $*/#ifndef __libmisc_transmitter_h__#define __libmisc_transmitter_h__#include <sstream>#include <iostream>#include <sigc++/signal_system.h>using std::cout;
using std::cerr;
using std::endl;
class Transmitter : public std::stringstream, public SigC::Object
{
public:
enum Channel {
Info,
Error,
Warning,
Fatal,
Throw
};
Transmitter (Channel);
SigC::Signal2<void,Channel, const char *> &sender() {
return *send;
}
bool does_not_return ();
protected:
virtualvoid deliver ();
friend std::ostream& endmsg (std::ostream &);
private:
Channel channel;
SigC::Signal2<void, Channel, const char *> *send;
SigC::Signal2<void, Channel, const char *> info;
SigC::Signal2<void, Channel, const char *> warning;
SigC::Signal2<void, Channel, const char *> error;
SigC::Signal2<void, Channel, const char *> fatal;
};
/* for EGCS 2.91.66, if this function is not compiled within the same compilation unit as the one where a ThrownError is thrown, then nothing will catch the error. This is a pretty small function, so inlining it here seems like a reasonable workaround.*/inline std::ostream &
endmsg (std::ostream &ostr)
{
Transmitter *t;
/* There is a serious bug in the Cygnus/GCC libstdc++ library: cout is not actually an ostream, but a trick was played to make the compiler think that it is. This will cause the dynamic_cast<> to fail with SEGV. So, first check to see if ostr == cout, and handle it specially. */if (&ostr == &cout) {
cout << endl;
return ostr;
} elseif (&ostr == &cerr) {
cerr << endl;
return ostr;
}
if ((t = dynamic_cast<Transmitter *> (&ostr)) != 0) {
t->deliver ();
} else {
/* hmm. not a Transmitter, so just put a newline on it and assume that that will be enough. */
ostr << endl;
}
return ostr;
}
extern"C" { void pbd_c_error (constchar *); }
#endif // __libmisc_transmitter_h__